Subversion Repositories altor32

//-----------------------------------------------------------------
//                           AltOR32 
//                Alternative Lightweight OpenRisc 
//                            V2.0
//                     Ultra-Embedded.com
//                   Copyright 2011 - 2013
//
//               Email: admin@ultra-embedded.com
//
//                       License: LGPL
//-----------------------------------------------------------------
//
// Copyright (C) 2011 - 2013 Ultra-Embedded.com
//
// This source file may be used and distributed without         
// restriction provided that this copyright statement is not    
// removed from the file and that any derivative work contains  
// the original copyright notice and the associated disclaimer. 
//
// This source file is free software; you can redistribute it   
// and/or modify it under the terms of the GNU Lesser General   
// Public License as published by the Free Software Foundation; 
// either version 2.1 of the License, or (at your option) any   
// later version.
//
// This source is distributed in the hope that it will be       
// useful, but WITHOUT ANY WARRANTY; without even the implied   
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      
// PURPOSE.  See the GNU Lesser General Public License for more 
// details.
//
// You should have received a copy of the GNU Lesser General    
// Public License along with this source; if not, write to the 
// Free Software Foundation, Inc., 59 Temple Place, Suite 330, 
// Boston, MA  02111-1307  USA
//-----------------------------------------------------------------
 
//-----------------------------------------------------------------
// Module: altor32_ram_dp - Dual port RAM (used in cache)
//-----------------------------------------------------------------
module altor32_ram_dp
#(
    parameter               WIDTH = 8,
    parameter               SIZE = 14
)
(
    input                   aclk_i /*verilator public*/,
    output [(WIDTH - 1):0]  adat_o /*verilator public*/,
    input [(WIDTH - 1):0]   adat_i /*verilator public*/,
    input [(SIZE - 1):0]    aadr_i /*verilator public*/,
    input                   awr_i /*verilator public*/,
 
    input                   bclk_i /*verilator public*/,
    output [(WIDTH - 1):0]  bdat_o /*verilator public*/,
    input [(WIDTH - 1):0]   bdat_i /*verilator public*/,
    input [(SIZE - 1):0]    badr_i /*verilator public*/,
    input                   bwr_i /*verilator public*/
);
 
//-----------------------------------------------------------------
// Registers
//-----------------------------------------------------------------
/* verilator lint_off MULTIDRIVEN */
reg [(WIDTH - 1):0]     ram [((2<< (SIZE-1)) - 1):0] /*verilator public*/;
/* verilator lint_on MULTIDRIVEN */
 
reg [(SIZE - 1):0]      rd_addr_a;
reg [(SIZE - 1):0]      rd_addr_b;
 
//-----------------------------------------------------------------
// Processes
//-----------------------------------------------------------------
always @ (posedge aclk_i)
begin
    if (awr_i == 1'b1)
        ram[aadr_i] <= adat_i;
    rd_addr_a <= aadr_i;
end
always @ (posedge bclk_i)
begin
    if (bwr_i == 1'b1)
        ram[badr_i] <= bdat_i;
    rd_addr_b <= badr_i;
end
 
//-------------------------------------------------------------------
// Combinatorial
//-------------------------------------------------------------------
assign adat_o = ram[rd_addr_a];
assign bdat_o = ram[rd_addr_b];
 
endmodule